The Life and Times of Kea

So why do humans call this time of year fall? I hear my mom say it's fall now and winter isn't far behind. She doesn't seem to be falling down and I just don't understand what she means. Yeah it's different here in WV than it was in TX but I just don't understand?? Course if fall means that I get to go for more walks like I did this weekend then I'm all for it!!!!!